title: [Natural birth control using the Billing's method].
authors.forename: E L
authors.initials: EL
authors.lastname: Hansen
authors.forename: E
authors.initials: E
authors.lastname: Jødal
mesh_terms: D000328:Adult; D003267:Contraception / Q000379:methods*; D005193:Family Planning Services; D005260:Female; D006801:Humans; D012252:Natural Family Planning Methods; D014621:Vagina / Q000378:metabolism
vernacular_title: Naturlig fødselsregulering med Billingsmetoden.